CVE-2026-18374
Passing an effectively empty string to the `,ccs=` syntax extension of the mode argument in the `fopen` function in the GNU C Library version 2.45 or earlier may result in a heap buffer overflow when
02 Description
Passing an effectively empty string to the `,ccs=` syntax extension of the mode argument in the `fopen` function in the GNU C Library version 2.45 or earlier may result in a heap buffer overflow when
03 Exploitation and scoring
- Exploitation
- Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
- SSVC decision
- ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
- AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
- Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
- EPSS probability
- 0.14% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 3.6% of scored records. A rank, not a probability.
- NVD base score
- 4.9 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
- NVD analysis status
- Awaiting Analysis. NVD last modified this record on 2026-09-03.
- Red Hat severity
- Moderate. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2026-08-27 19:20Z2 MO AGO
- Last updated
- 2026-08-28 15:37Z2 MO AGO
- Reserved
- 2026-07-30
- Assigning CNA
- glibc
- Record state
- PUBLISHED
- Severity
- Medium (CVSS 4.9)
- CNA CVSS vector
- CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
- Weaknesses
- Data version
- 5.2
- Document digest
- aa73c418b75e95a044f422194f52fc7284e363547775f65571768d2e771b7c14
05 Affected products
06 References
07 Fixed in
AlmaLinux 8
- compat-libpthread-nonshared Fixed in 2.28-251.el8_10.48
- glibc Fixed in 2.28-251.el8_10.48
- glibc-all-langpacks Fixed in 2.28-251.el8_10.48
- glibc-benchtests Fixed in 2.28-251.el8_10.48
- glibc-common Fixed in 2.28-251.el8_10.48
- glibc-devel Fixed in 2.28-251.el8_10.48
- glibc-doc Fixed in 2.28-251.el8_10.48
- glibc-gconv-extra Fixed in 2.28-251.el8_10.48
- glibc-headers Fixed in 2.28-251.el8_10.48
- glibc-langpack-aa Fixed in 2.28-251.el8_10.48
- glibc-langpack-af Fixed in 2.28-251.el8_10.48
- glibc-langpack-agr Fixed in 2.28-251.el8_10.48
- glibc-langpack-ak Fixed in 2.28-251.el8_10.48
- glibc-langpack-am Fixed in 2.28-251.el8_10.48
- glibc-langpack-an Fixed in 2.28-251.el8_10.48
- glibc-langpack-anp Fixed in 2.28-251.el8_10.48
- glibc-langpack-ar Fixed in 2.28-251.el8_10.48
- glibc-langpack-as Fixed in 2.28-251.el8_10.48
- glibc-langpack-ast Fixed in 2.28-251.el8_10.48
- glibc-langpack-ayc Fixed in 2.28-251.el8_10.48
- glibc-langpack-az Fixed in 2.28-251.el8_10.48
- glibc-langpack-be Fixed in 2.28-251.el8_10.48
- glibc-langpack-bem Fixed in 2.28-251.el8_10.48
- glibc-langpack-ber Fixed in 2.28-251.el8_10.48
- glibc-langpack-bg Fixed in 2.28-251.el8_10.48
- glibc-langpack-bho Fixed in 2.28-251.el8_10.48
- glibc-langpack-bi Fixed in 2.28-251.el8_10.48
- glibc-langpack-bn Fixed in 2.28-251.el8_10.48
- glibc-langpack-bo Fixed in 2.28-251.el8_10.48
- glibc-langpack-br Fixed in 2.28-251.el8_10.48
- glibc-langpack-brx Fixed in 2.28-251.el8_10.48
- glibc-langpack-bs Fixed in 2.28-251.el8_10.48
- glibc-langpack-byn Fixed in 2.28-251.el8_10.48
- glibc-langpack-ca Fixed in 2.28-251.el8_10.48
- glibc-langpack-ce Fixed in 2.28-251.el8_10.48
- glibc-langpack-chr Fixed in 2.28-251.el8_10.48
- glibc-langpack-cmn Fixed in 2.28-251.el8_10.48
- glibc-langpack-crh Fixed in 2.28-251.el8_10.48
- glibc-langpack-cs Fixed in 2.28-251.el8_10.48
- glibc-langpack-csb Fixed in 2.28-251.el8_10.48
172 further packages in AlmaLinux 8 not shown (first 40 listed).
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
AlmaLinux 9
- glibc Fixed in 2.34-283.el9_8
- glibc-all-langpacks Fixed in 2.34-283.el9_8
- glibc-benchtests Fixed in 2.34-283.el9_8
- glibc-common Fixed in 2.34-283.el9_8
- glibc-devel Fixed in 2.34-283.el9_8
- glibc-doc Fixed in 2.34-283.el9_8
- glibc-gconv-extra Fixed in 2.34-283.el9_8
- glibc-headers Fixed in 2.34-283.el9_8
- glibc-langpack-aa Fixed in 2.34-283.el9_8
- glibc-langpack-af Fixed in 2.34-283.el9_8
- glibc-langpack-agr Fixed in 2.34-283.el9_8
- glibc-langpack-ak Fixed in 2.34-283.el9_8
- glibc-langpack-am Fixed in 2.34-283.el9_8
- glibc-langpack-an Fixed in 2.34-283.el9_8
- glibc-langpack-anp Fixed in 2.34-283.el9_8
- glibc-langpack-ar Fixed in 2.34-283.el9_8
- glibc-langpack-as Fixed in 2.34-283.el9_8
- glibc-langpack-ast Fixed in 2.34-283.el9_8
- glibc-langpack-ayc Fixed in 2.34-283.el9_8
- glibc-langpack-az Fixed in 2.34-283.el9_8
- glibc-langpack-be Fixed in 2.34-283.el9_8
- glibc-langpack-bem Fixed in 2.34-283.el9_8
- glibc-langpack-ber Fixed in 2.34-283.el9_8
- glibc-langpack-bg Fixed in 2.34-283.el9_8
- glibc-langpack-bhb Fixed in 2.34-283.el9_8
- glibc-langpack-bho Fixed in 2.34-283.el9_8
- glibc-langpack-bi Fixed in 2.34-283.el9_8
- glibc-langpack-bn Fixed in 2.34-283.el9_8
- glibc-langpack-bo Fixed in 2.34-283.el9_8
- glibc-langpack-br Fixed in 2.34-283.el9_8
- glibc-langpack-brx Fixed in 2.34-283.el9_8
- glibc-langpack-bs Fixed in 2.34-283.el9_8
- glibc-langpack-byn Fixed in 2.34-283.el9_8
- glibc-langpack-ca Fixed in 2.34-283.el9_8
- glibc-langpack-ce Fixed in 2.34-283.el9_8
- glibc-langpack-chr Fixed in 2.34-283.el9_8
- glibc-langpack-ckb Fixed in 2.34-283.el9_8
- glibc-langpack-cmn Fixed in 2.34-283.el9_8
- glibc-langpack-crh Fixed in 2.34-283.el9_8
- glibc-langpack-cs Fixed in 2.34-283.el9_8
175 further packages in AlmaLinux 9 not shown (first 40 listed).
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
AlmaLinux 10
- glibc Fixed in 2.39-145.el10_2.alma.1
- glibc-all-langpacks Fixed in 2.39-145.el10_2.alma.1
- glibc-benchtests Fixed in 2.39-145.el10_2.alma.1
- glibc-common Fixed in 2.39-145.el10_2.alma.1
- glibc-devel Fixed in 2.39-145.el10_2.alma.1
- glibc-doc Fixed in 2.39-145.el10_2.alma.1
- glibc-gconv-extra Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-aa Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-af Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-agr Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-ak Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-am Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-an Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-anp Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-ar Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-as Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-ast Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-ayc Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-az Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-be Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-bem Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-ber Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-bg Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-bhb Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-bho Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-bi Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-bn Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-bo Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-br Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-brx Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-bs Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-byn Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-ca Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-ce Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-chr Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-ckb Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-cmn Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-crh Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-cs Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-csb Fixed in 2.39-145.el10_2.alma.1
181 further packages in AlmaLinux 10 not shown (first 40 listed).
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 8
- compat-libpthread-nonshared Fixed in 2.28-251.el8_10.48
- glibc Fixed in 2.28-251.el8_10.48
- glibc-all-langpacks Fixed in 2.28-251.el8_10.48
- glibc-benchtests Fixed in 2.28-251.el8_10.48
- glibc-common Fixed in 2.28-251.el8_10.48
- glibc-devel Fixed in 2.28-251.el8_10.48
- glibc-doc Fixed in 2.28-251.el8_10.48
- glibc-gconv-extra Fixed in 2.28-251.el8_10.48
- glibc-headers Fixed in 2.28-251.el8_10.48
- glibc-langpack-aa Fixed in 2.28-251.el8_10.48
- glibc-langpack-af Fixed in 2.28-251.el8_10.48
- glibc-langpack-agr Fixed in 2.28-251.el8_10.48
- glibc-langpack-ak Fixed in 2.28-251.el8_10.48
- glibc-langpack-am Fixed in 2.28-251.el8_10.48
- glibc-langpack-an Fixed in 2.28-251.el8_10.48
- glibc-langpack-anp Fixed in 2.28-251.el8_10.48
- glibc-langpack-ar Fixed in 2.28-251.el8_10.48
- glibc-langpack-as Fixed in 2.28-251.el8_10.48
- glibc-langpack-ast Fixed in 2.28-251.el8_10.48
- glibc-langpack-ayc Fixed in 2.28-251.el8_10.48
- glibc-langpack-az Fixed in 2.28-251.el8_10.48
- glibc-langpack-be Fixed in 2.28-251.el8_10.48
- glibc-langpack-bem Fixed in 2.28-251.el8_10.48
- glibc-langpack-ber Fixed in 2.28-251.el8_10.48
- glibc-langpack-bg Fixed in 2.28-251.el8_10.48
- glibc-langpack-bho Fixed in 2.28-251.el8_10.48
- glibc-langpack-bi Fixed in 2.28-251.el8_10.48
- glibc-langpack-bn Fixed in 2.28-251.el8_10.48
- glibc-langpack-bo Fixed in 2.28-251.el8_10.48
- glibc-langpack-br Fixed in 2.28-251.el8_10.48
- glibc-langpack-brx Fixed in 2.28-251.el8_10.48
- glibc-langpack-bs Fixed in 2.28-251.el8_10.48
- glibc-langpack-byn Fixed in 2.28-251.el8_10.48
- glibc-langpack-ca Fixed in 2.28-251.el8_10.48
- glibc-langpack-ce Fixed in 2.28-251.el8_10.48
- glibc-langpack-chr Fixed in 2.28-251.el8_10.48
- glibc-langpack-cmn Fixed in 2.28-251.el8_10.48
- glibc-langpack-crh Fixed in 2.28-251.el8_10.48
- glibc-langpack-cs Fixed in 2.28-251.el8_10.48
- glibc-langpack-csb Fixed in 2.28-251.el8_10.48
172 further packages in CloudLinux 8 not shown (first 40 listed).
Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 9
- glibc Fixed in 2.34-283.el9_8
- glibc-all-langpacks Fixed in 2.34-283.el9_8
- glibc-benchtests Fixed in 2.34-283.el9_8
- glibc-common Fixed in 2.34-283.el9_8
- glibc-devel Fixed in 2.34-283.el9_8
- glibc-doc Fixed in 2.34-283.el9_8
- glibc-gconv-extra Fixed in 2.34-283.el9_8
- glibc-headers Fixed in 2.34-283.el9_8
- glibc-langpack-aa Fixed in 2.34-283.el9_8
- glibc-langpack-af Fixed in 2.34-283.el9_8
- glibc-langpack-agr Fixed in 2.34-283.el9_8
- glibc-langpack-ak Fixed in 2.34-283.el9_8
- glibc-langpack-am Fixed in 2.34-283.el9_8
- glibc-langpack-an Fixed in 2.34-283.el9_8
- glibc-langpack-anp Fixed in 2.34-283.el9_8
- glibc-langpack-ar Fixed in 2.34-283.el9_8
- glibc-langpack-as Fixed in 2.34-283.el9_8
- glibc-langpack-ast Fixed in 2.34-283.el9_8
- glibc-langpack-ayc Fixed in 2.34-283.el9_8
- glibc-langpack-az Fixed in 2.34-283.el9_8
- glibc-langpack-be Fixed in 2.34-283.el9_8
- glibc-langpack-bem Fixed in 2.34-283.el9_8
- glibc-langpack-ber Fixed in 2.34-283.el9_8
- glibc-langpack-bg Fixed in 2.34-283.el9_8
- glibc-langpack-bhb Fixed in 2.34-283.el9_8
- glibc-langpack-bho Fixed in 2.34-283.el9_8
- glibc-langpack-bi Fixed in 2.34-283.el9_8
- glibc-langpack-bn Fixed in 2.34-283.el9_8
- glibc-langpack-bo Fixed in 2.34-283.el9_8
- glibc-langpack-br Fixed in 2.34-283.el9_8
- glibc-langpack-brx Fixed in 2.34-283.el9_8
- glibc-langpack-bs Fixed in 2.34-283.el9_8
- glibc-langpack-byn Fixed in 2.34-283.el9_8
- glibc-langpack-ca Fixed in 2.34-283.el9_8
- glibc-langpack-ce Fixed in 2.34-283.el9_8
- glibc-langpack-chr Fixed in 2.34-283.el9_8
- glibc-langpack-ckb Fixed in 2.34-283.el9_8
- glibc-langpack-cmn Fixed in 2.34-283.el9_8
- glibc-langpack-crh Fixed in 2.34-283.el9_8
- glibc-langpack-cs Fixed in 2.34-283.el9_8
175 further packages in CloudLinux 9 not shown (first 40 listed).
Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 10
- glibc Fixed in 2.39-145.el10_2.alma.1
- glibc-all-langpacks Fixed in 2.39-145.el10_2.alma.1
- glibc-benchtests Fixed in 2.39-145.el10_2.alma.1
- glibc-common Fixed in 2.39-145.el10_2.alma.1
- glibc-devel Fixed in 2.39-145.el10_2.alma.1
- glibc-doc Fixed in 2.39-145.el10_2.alma.1
- glibc-gconv-extra Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-aa Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-af Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-agr Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-ak Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-am Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-an Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-anp Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-ar Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-as Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-ast Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-ayc Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-az Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-be Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-bem Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-ber Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-bg Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-bhb Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-bho Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-bi Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-bn Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-bo Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-br Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-brx Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-bs Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-byn Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-ca Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-ce Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-chr Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-ckb Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-cmn Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-crh Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-cs Fixed in 2.39-145.el10_2.alma.1
- glibc-langpack-csb Fixed in 2.39-145.el10_2.alma.1
181 further packages in CloudLinux 10 not shown (first 40 listed).
Derived from AlmaLinux 10. Partial coverage: only packages taken from AlmaLinux 10 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Debian 12
- glibc No fix yet
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- glibc No fix yet
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- glibc Fixed in 2.43-5
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 22.04 LTS
- glibc No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 24.04 LTS
- glibc No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 26.04 LTS
- glibc No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 14.04 LTS
- eglibc No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 16.04 LTS
- glibc No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 18.04 LTS
- glibc No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 20.04 LTS
- glibc No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.